IBM 770 manual System Board I/O Address Map, 3 is the I/O address map, System Overview

System Board I/O Address Map

Figure 1-3 is the I/O address map.

Address

(Hex)

Device

0000–001F

DMA

Controller

(0–3)

0020,

0021

Interrupt

Controller

(master)

0022–002F

Reserved

0040–0043

System

Timer

1

0048–004B

Reserved

0060

Keyboard,

Auxiliary

Device

0061

System

Control

Port

B

0062,

0066

Slave Controller

0064

Keyboard,

Auxiliary

Device

0070,

0071

RT/CMOS

and

NMI

Mask

0072,

0073

Extended

RT

and

CMOS

0074,

0075,

0076

Reserved

0081–0083,

0087

DMA

Page

Registers

(0–3)

0089–008B,

008F

DMA

Page

Registers

(4–7)

0092

System

Control

Port

A

0096

Reserved

0098

System Flash ROM Control Register (DCR

2282)

00A0,

00A1

Interrupt

Controller

(slave)

00B2–00B3

Power

Management Register

00C0–00DF

DMA

Controller

(4–7)

00F0–00FF

Reserved

0130–013F

ThinkPad

Modem

0170–0177

Secondary

IDE

Registers

01F0–01F7

Primary

IDE

Registers

0201

Joystick

Port

0220–0233

Audio Subsystem - Sound Blaster

0240–0253

Audio Subsystem - Sound Blaster

026E,

026F

Super

I/O

Configuration Registers

0260–0273

Audio Subsystem - Sound Blaster

0278–027A

Parallel

Port

3

027B–027F

Reserved

0280–0283

Audio Subsystem - Sound Blaster

02E8–02EF

Serial

Port

4

02E8–02EF

IR

Port

4

02F8–02FF

Serial

Port

2

02F8–02FF

IR

Port

2

0300–0303

MIDI

Port

1

0310–0313

MIDI

Port

2

0320–0323

MIDI

Port

3

Figure

1-3

(Part

1 of 2).

System Board I/O Address Map

System Overview 1-5